Pneumatic-tire-pressure gage.



C. HARRISON & K. LAMOND.

PNEUMATIC TIRE PRESSURE GAGE. APPLICATION FILED IAN. II.I9I,6. y

Mim? E `Patented Feb, 6,1917.

Xenne Zar/10x35? l CHARLES HRRESN .AND KENNETH LAMOND, 0F VANCOUVER, BRITISH COLUMBIA, CANADA, SSIGNORS TO VANCOUVER. MTQR SUPPLIES LIMITED, 0F VANCUVEE,

BRITISH Communie, sartene.

PIEUMATI@TIRE-PRESSIRE GAGE.

Speeication of Letters Patent.

Patenten een e, iai e.

Application filed January 1l, 1316. Serial o. 71,506.

To all wwm t may concern: A

Be it known that we, CHARLES HARRISON 4and KENNETH LAMOND, both citizens of the Improvements in Pneumatic-Tire-Pressure Gages, df which the following is a specication.,

This invention relates to a pressure gage for a pneumatic tire and is designed to indcate the pressure of the air inlating a pneumatic tire by the expansion of a section of the tire itself, against a spring resistance.-

This object is attained by projecting through the rim of the wheel into Contact with the inner tube of its tire, a member having a spring resistance from its normal or outwardly projected position from the rim. rlhis member, as the tire isl inflated, will be pressed inward from'the inner circle of the rim against the spring resistance, and will indicate in the amount it is pressed the pressure of the air with which the tire is inflated. i

As the valved tube through which a tire is inflated, is attached to the inner tube of a tire and projects through the rim of its wheel, this Y valved tube itself forms a convenient means for attachment of the pressure indicating spring and scale.

The device is particularly described in the following specification, reference being made to the drawings by which it is accompanied, in which:

Figure 1 is a longitudinal section of the device in its simplest form as applied to the tire valve. F ig. 2, a similar view showing a modification adapted to a tension spring, and Fig. 3, a section of the rim of a wheel and its inner tube showing the valve tube and gage in elevation. Figs. 4 and 5 are detail sections on a larger scale of portions of the invention. Fig. 6 is a detail View of a modification of the invention hereinafter referred to.

n these drawings 2 represents the rim of the wheel and e the inner tube of the tire, 4 being thevalved tube through which the tire is charged with air, in which tube is the retaining check valve. This valve tube 4 is secured at 5 to the inner tube 3 in the usual manner and is provided with a guard 6 protecting the tire tube B'adjacent the at- 'tachment.

rthe valve 4, as is usual, projects through an aperture in the rim 2 of the wheel, and is threaded at the outer end, as at 7, for connection to it of the flexible air charging tube and for the cap 8 by which it is protected.

Instead of, as is usual, securing the tube 4 in the rim of the wheel it is endwise movable in a tubular bushing 10 which is secured in the rim 2 between a ianged end 1l on the outer side of the rim and a'nut 12 threaded onto the tube against the inside of the rim.A

The inner threaded end projects within the circle of the rim 2 of the wheel toward the end of the valve tube 4.

In its simplest form, a coil compression spring 13 is introduced between a shoulder 14 formed on the valve tube 4 adjacent the attachment of that tube tov the tire tube 3 and an inwardly projecting shoulder 15 formed on the inner end of the bushing tube l0, so that as' the tire tube 3 is iniated it will press the valveI tube 4 through the inner circle of the rim of the wheel against the resistance of the spring 13, and the amount of suchy inward movement will indicate the pressure with which the tire is inflated.

In its preferred form, as shown in F ig. 3, a coil tension spring 16 is secured at one end to the tubular bushing 10I adjacent the fiange 11 and at the other end to the stem 4. These attachments tothe bushing and the stem may be madein any approved manner: In the drawing a stem guide-bushing 17 is externally threaded to fit in the end of the bushing 10 and the inner end of it is internally threaded that the end of the coil spring may be screwed upon and se cured to it. Similarly at .the other end, a member 18 is threaded as a. nut to fit on the end of the valve tube 4 and the inner cud of the member is externally 'threaded to receive the end of the spring 16. c 'lfhis nut attachment provides a means whereby the tension of the spring maybe regulated.

Integral with or secured to the nut mem.- ber 18, or independently threaded en the valve stein 4, is an indicating sleevemember 19 itting over the inwardly projecting end of the tubular bushing l0 Which'is graduated. that the position of the edge of the sleeve 19,1nay indicate the pressure of the air vinlating the tire tube 3.

Vte do not desire td ,be confined to the particular character to the manner of attachment ofthe saine to the stem i and to the rim 2 of the wheel, as the same may be varied within wide limits. The guard member 6 may be lengtliened to bear against the rim of the wheel the resilient resistance to inward movement ,of the tube 4 from the inner tube d of the' endwise movable in'said bushing tube,I mea'ns' for clamping the inner end of said member to the inner tube, said tire "valve member adapted to be pressed outwardly by the linflation of the inner tube, resilient means opposing the outward mo 'rement 'and a tire i'ntlating valve within sai tire,valve mem- 80 ber,'said tire valve member havinga passage through the same controlled by said tire in- Hating valve wherebyvthe inner tube of the tire maybe 'inlated through said tire valve member. 2. -Atire pressure gage,`comprising the combination with the rim of a wheel andthe inner tube of a tire, of a bushing'tube secured to the rim and passing through an 4aperture in the same, a tubular tirel valve '48) member endwise' movable insaid bushing.

' tube tire avalve me'mber whereby the tire may be 'inflated4 through said tire val-ve member, means for clamping the inner end of said member to lthe inner tube, said tire Vvalve member adapted to be pressedoutwardly by the1 inflation of vthe inner tube, means opposing the outward movement, and pressure indicating instrumentalities cope'rating with said tire valve member and said bushing tube for indicating the air pressure .withi'n the tire tube.- y

' 3.'A tire pressure gage, comprising the combinat'ion'withthe rim of a wheel and the inner tube vot' a' tire, of ,a -bushing tube se-` cured to the rim' and passing through the L aperture in the same,` a tire valve: member endwise movable in said bushing tube, and having 'a passage may be inflated, a tire inlating valve in said valve member passage, means for clamping the inner end of said membery to the-innerI tube, said tire valve member adapted to be pressed outwardly by thei'nl'lation of Vthe inner tuberesilient means opposing the outof the spring used orand be made of spring steel so as to form` a. tireinflating valve in said tubular'v resilient ward movement, and a guard member -lo- .cated between the rim' and thetire tube advjacent Ito the tire valve. member.`

. 4. A tire pressure gage,I comprising the 'combination with the rim of a wheel and thev inner tube of a tire, o f'a. bushing tube Secured to the rim' 4and aperture in the same, a, tire valve'member endwise movable in said bushing tube, tirevalve, member having.' azpassage through the same :and an iniiating valvev located in.

passing through the said c flated through saidtire valve member, means for clamping the inner end of said member to the inner tube,- said tirevalve member' adapted to be'p'ressed outwardly' bythe iiitlation of the inner tube,A resilient' lmeans opposing the outward movement', a guard I member located,between the rim and the tire.

tube aCent tothe tire valve member, said pressure indicating instrumentalities com-` prising' graduation v -marks on said bushing tube andanindil'cating sleeve carried bysaid A tire ,pressure gage, comprising, the

combination with therim of a. wheelnd thf.-

endwise slidable v'alve tubethrough which.,

the inner ytube oit vthe tire is inflated, of'ffspringone end of which rim of the ywheetand the' other.end to the* va-lvetube, 4means forjindicating endwise'."

' movement of the valve. tube, and means for securing the inner end of said 'valve'tubey to" the inner tube of the tire, aninating val'v'einnsaid valve tube, said valve tube being adapt# l inner tube of the tire whereby the tire. may be inflated through said valve tub'e.-

' 6.' A tire pressure gage comprising'jin comedA to communicate.with theninterior ofpthe bination with the rim of aavheel havingatire valve aperture, and the innertube of a tire, of'l 'i a n .inflating valve tube endwise movable in the' rim aperture, an inflating'valve in saidrtube, means for securing thel inner- 'e'nd of said valve tube in air-tight engagement witlithe inner tubeot` the-'tire whereby said inner: tube ymay be .inflated through said valvetube member, said valvel tube member adapted to`y be' pressed outwardly byl the inflation of the opposing the outward movement of ,the tir valve tube. f

v 7. vA tirepressure gage comprising @ag a tire' valve stem'passing through ,saidbushf ing tube, a-tire valveproperin'said stem,

means for clamping'tlie inner lend of .said stein securely to a tire tubefwher'eby the tube mayl be inflated through the stem, said valve stenihaving its outer end threaded, meanson said threaded end of the valve stem for engaging said bushing tube, a spring Within said bushing tube and adapted to resist the movement of said tire valve stem against the air pressure in -the tire tube, and pressure indicating instrumentalities coperating with the stem and bushing, substantially as shown and described.

8. In a tire pressure gage, the combination with the rim of the Wheel and the inner tube of the tire, of a valve casing endvvise movable inthe rim of the Wheel, an inflating valve in said valve casing the inner end of vwhich valve casing is in engagement with the inner tube of the tire, and adapted to be pressed outwardly by the inflation of the tube, a plug in the rim, said plug having a bore for the passage of said endwise movable valve casing and having a spring securing groove, a coil spring having one end seated in said spring securing groove, and surrounding said endivise movable member, a second bushing on-said endwise movable valve casing, said second bushing also having a spring receiving and securing groove in which the other end of said spring is seated, all being arranged whereby the tire may be inflated through said valve casing, substantially as shown and described.

9. In a tire pressure gage, the combination With the rim of the Wheel and the inner tube of the tire, of a valve casing endWise movable in the rim of the wheel, an inflating valve Within said valve casing whereby the tire may be inflated through said valve casing, the `inner end of which valve casing is in engagement with theinner tube of the tire and adapted to be pressed outwardly by the inflation of the tube, a plug in the rim, said plug having a bore for the passage of said endWise movable valve casing and having a spring securing groove, a coil spring having one end seated in said spring securing groove, and surrounding said endwise movable valve casing, a second bushing on said endwise movable valve casing, said second bushing also having a spring receiving and securing groove in which the other end of said spring is seated, and a tubular member for inclosing said spring and means on said endvvise movable valve casing for indicating the pressure Within the tire tube.

l0. In a tire pressure gage, the combination with the rim of the wheel and the inner tube of the tire, of a member endwise movable in the rim of the Wheel, the inner end of which member is in engagement with the inner tube of the tire"and adapted to be pressed outwardly by the inflation of the tube, a plug in the rim, said plug having a bore for the passage of said endwise movable member and having a spring securing groove, a coil spring having one end seated in said spring securing groove, and surrounding said endwise movable member, a. second bushing on said endwise movable member, said second bushing also having a spring receiving and securing groove in which the other end of said spring is seated, a tubular member for inclosing said spring, means on said endwise movable member for indicating the pressure Within the tire tube, said movable member comprising an inflation valve stem, means for securing said stem to the inner tube whereby the inner tube may be inflated through said stem, and a guard member carried by said stem adjacent the inner tube, substantially as shown and described.

In testimony whereof We aliix our signa-- tures.

CHARLES HARRISON. KENNETH LAMOND. 

